FabFilter Timeless, £69
Now in its second incarnation, Timeless is maxed out with all manner of modulation. At its heart it's a classic stereo tape delay, but FabFilter has added filtering, time-stretching and its magnificent modulation matrix. Tap tempo is supported, or Timeless can sync to the host.
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Artificial Audio Obelisk, €99
A wonderfully advanced multi-effect built around a spectral delay. Incoming audio is separated into multiple frequency bands which are treated independently. LFOs, spectral filter and gate are included to warp your sound, and modulation can be 'drawn' into the Analyzer Point View. Neat!
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PSP Audioware Lexicon PSP 42, $149
One of a trio of delays built around its classic hardware units, the PSP 42 adheres to Lexicon's design and is approved by Lexicon. A stereo unit with a very retro sound, it has all the original's modulation options plus the ability to invert the feedback and delay channels.
Find out more about PSP Audioware Lexicon PSP 42
Togu Audio Line TAL-Dub, Free
Togu Audio Line has provided yet another brilliant freebie with this vintage-style delay effect. There's a 12dB filter on board, along with the ability to set independent delay times and feedback for each channel (though these can be linked if you want). It can be used as a plain old filter too.
Find out more about Togu Audio Line TAL-Dub